It all depends on what the provider is sending and what you purchased. I would think a minimum of 256K but may be better.
What Speed Should I Expect On Comcast Broadband?
Well it depends upon the broadband link you purchased. You can start from 256 kbp and can go in MBs. The more broadband you would demand, the more will be the cost. You can at least expect 256KBPS from your broadband.